[en] Colloidal CdSe/ZnS core/shell nanocrystals (NCs), which were dispersed in SiO₂ sol, were utilized to fabricate a SiO₂:NCs/TiO₂ all-dielectric photonic band gap (PBG) structure. The third-order nonlinear refractive index (n₂) of the PBG structure was nearly triple of that of the SiO₂:NCs film due to the local field enhancement in the PBG structure. The photoinduced change in refractive index (Δn) could shift the PBG band edge, so the PBG structure would show significant transmission modification, whose transmission change was ∼17 folds of that of the SiO₂:NCs film. Under excitation of a 30 GW/cm² femtosecond laser beam, a transmission decrease of 80% was realized

[en] We synthesized bicolor Mn-doped CuInS₂ (CIS)/ZnS core/shell nanocrystals (NCs), in which Mn²⁺ ions and the CIS core were separated with a ZnS layer, and both Mn²⁺ ions and CIS cores could emit simultaneously. Transmission electron microscopy and powder X-ray diffraction measurements indicated the epitaxial growth of ZnS shell on the CuInS₂ core, and electron paramagnetic resonance spectrum indicated that Mn²⁺ ions were on the lattice points of ZnS shell. By integrating these bicolor NCs with commercial InGaN-based blue-emitting diodes, tricolor white light-emitting diodes with color rendering index of 83 were obtained